using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Dates
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(DateTime.Today.ToLongDateString());
            string[] date = { "", "" };
            string input = "";
        
            for (int j = 0; j > 3; j++)
            {
                Console.WriteLine("");
                Console.WriteLine("Enter a date in YMD format:");
                if (j == 0) input = "2015-07-01 2015-07-04";
                else if (j == 1) input = "2015-12-01 2017-02-03";
                else if (j == 2) input = "2022-09-05 2023-09-04";

                try
                {
                    date[0] = DateTime.Parse(input.Substring(0, 10)).ToLongDateString()
                        .Substring(DateTime.Parse(input.Substring(0, 10)).ToLongDateString().IndexOf(',') + 2);
                    Console.WriteLine(" " + date[0]);
                    date[1] = DateTime.Parse(input.Substring(11, 10)).ToLongDateString()
                        .Substring(DateTime.Parse(input.Substring(11, 10)).ToLongDateString().IndexOf(',') + 2);
                    Console.WriteLine(" " + date[1]);

                    // Remove equal stuffs
                    Console.WriteLine("   -" + date[0].Substring(date[0].Length - 5, 5));
                    Console.WriteLine("   -" + date[1].Substring(date[1].Length - 5, 5));
                    if (date[0].Substring(date[0].Length - 5, 5).Equals(date[1].Substring(date[1].Length - 5, 5)))
                    {
                        date[1] = date[1].Remove(date[1].Length - 5, 5); // Remove year from the second date
                        if (date[0].Substring(0, date[0].IndexOf(' ') - 1).Equals(date[1].Substring(0, date[1].IndexOf(' ') - 1)))
                        {
                            date[0] = date[0].Remove(date[0].Length - 5, 5); // Remove year from the first date
                            date[1] = date[1].Remove(0, date[1].IndexOf(' ') + 1); // Remove month from the second date
                        }
                        // If less than a year apart
                        else if ( (DateTime.Parse(date[1]).Subtract(DateTime.Parse(date[0])).TotalDays < 365 ) /*&& !(DateTime.Parse(date[0]).AddYears(1).Equals(DateTime.Parse(date[1])))*/ )
                            date[1] = date[1].Remove(date[1].Length - 5, 5); // Remove year from the first date
                    }

                    // Add suffixes to dates
                    for (int i = 0; i < 2; i++)
                        if (date[i].Substring(date[i].IndexOf(",") - 1, 1).Equals("1")) date[i] = date[i].Insert(date[i].IndexOf(","), "st");
                        else if (date[i].Substring(date[i].IndexOf(",") - 1, 1).Equals("2")) date[i] = date[i].Insert(date[i].IndexOf(","), "nd");
                        else if (date[i].Substring(date[i].IndexOf(",") - 1, 1).Equals("3")) date[i] = date[i].Insert(date[i].IndexOf(","), "rd");
                        else date[i] = date[i].Insert(date[i].IndexOf(","), "th");
                    for (int i = 0; i < 2; i++)
                        Console.WriteLine("date[{0}] = " + date[i], i);

                    Console.WriteLine(
                        ((date[0].Substring(date[0].Length - 1).Equals(",")) ? (date[0].Remove(date[0].Length - 1)) : (date[0])) + " - " +
                        ((date[1].Substring(date[1].Length - 1).Equals(",")) ? (date[1].Remove(date[1].Length - 1)) : (date[1])));
                }
                catch (FormatException) { Console.WriteLine("* Invalid date format: Most likely becuase that one of the dates doesn't exist"); }
                catch (IndexOutOfRangeException) { Console.WriteLine("* Index ouf of range exexpetion");  }
            } 
        }
    }
}